Very impressive! How far are we from having this sort of thing in VR? The paper says the model render time was 0.9s which I guess means very far if that is per frame?
instant-ngp ([1]) from NVIDIA can render NeRF in VR in real-time, assuming a very good desktop video card. Note that instant-ngp is not as photo-realistic as Zip-NeRF. But it's still very good!